X  dust-collector



(No Model.) 2 Sheets-Sheet 1.

J. J. GERARD.

DUST COLLECTOR.

No. 456,810. Patented July 28, 1891.

7775770726. II? #01707. MM /m 763302110.

2 Sheets-Sheet 2.

Patented July 28, 1891.

J. J. GERARD. DUST COLLECTOR.

iii

(No Model.)

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UNTT D STATES PATENT OFFICE.

JOHN J. GERARD, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR TO THE ED ARD P.ALLIS COMPANY, OF MILIVAUKEE, WISCONSIN.

DUST-COLLECTOR.

SPECIFICATION forming part of Letters Patent No. 456,810, dated July 28,1891.

Application filed January 4:, 1890. Serial No. 335,884. (No model.)

To all whom it may concern.-

Be it known that I, JOHN J. GERARD, of Minneapolis, in the county ofHennepin and State of Minnesota, have invented certain Improvements inDust-Collectors, of which the following is a specification.

The object of this invention is to provide an improved machine designedto be used in flour-mills in connection with middlings-purifiers orother suitable machines for the purpose of separating particles of dustfrom a current of dust-laden air.

The invention consists, generally, in a machine having a cloth or otherflexible separating medium formed into a series of pockets, that areheld in a distended position by means of suitable springs, and mechanismfor collapsing said pockets against the tension of the springs and thensuddenly releasing them and permitting them to move back quickly totheir former position, thereby shaking the cloth, so that the adheringdirt will fall from it into a suitable carrier or receptacle.

The invention consists, further, in certain features of construction andcombination hereinafter described, and particularly pointed out in theclaims.

In the accompanying drawings, forming a part of this specification,Figure 1 is a sectional side elevation of a machine embodying myinvention. Fig. 2 is a transverse vertical section of the same on line c00 of Fig. 1 and looking in the direction of the arrow in said Fig. 1.Fig. 3 is a detail on a larger scale of the dust-carrier. Fig. 4 is adetail longitudinal section, and Fig. 5 is a detail transverse sectionshowinga modification of the arrangement of the spring.

In the drawings, 2 represents the casing of the machine, and it maybethe casing of any ordinary middlings-purifier, having a fan 3 located inthe upper portion thereof, by means of which a current of air is drawnthrough the machine in the usual way. Arranged in this casing is asuitable dust-collecting medium, through which the air is drawn by thefan. As the air passes through this medium the particles of dust carriedby it will be removed. The dust-collecting medium consists, preferably,of a suitable cloth '7, formed into a series of pockets 9. The lowerends of the pockets are secured to suitable cross-bars 11, and at thetops of the pockets the cloth preferably passes over suitable standards13, and these standards pass through openings in. the longitudinalbars17, which are arranged upon opposite sides of the machine. The lowerends of the standards a e connected to crossbars 19, and the ends ofthese bars are ar-' ranged between blocks 21, located upon the oppositesides of the machine. The upper ends of the standards 15 are connectedto suitable spring-bars 23, and these bars are preferably supported attheir centers upon a longitudinal bar 25. The standards 15 are free toslide longitudinally, and they are held at the upper limit of theirmovement by the springbars 23, and by this means the cloth forming thewalls of the pocket is normally kept taut. The lower ends of thestandards 15 are screw-threaded, and are provided with nuts 18, whichlimit the upward movement of the standards and consequently the amount01' tension or strain exerted by the springs on the cloth.

Arranged at the opposite ends of the machine are suitable shafts 27,which are provided with sprocket-wheels 29. Chains 31 pass around thesesprocket-wheels and beneath the open ends of the pockets 9. Secured uponthese chains are a series of slats 33, arranged with spaces betweenthem, the ends of these slats projecting into the spaces between thelongitudinal bars17. A strip of cloth 35 is secured upon the top of theslats 33. This cloth extends across the spaces between said slats, andextending downward into said spaces forms a series of pockets 37 betweenthe slats. These slats and the cloths secured upon them togetherconstitute a dust carrier, that as the chains are moved by thesprocket-whcels passes beneath and close to the lower edges of thepockets, thereby cutting off the current of air from each pocket as thecarrier passes below it. Inclined blocks 39 are secured to the carrier,and as the carrier passes beneath each pocket these blocks engage thetop of the cross-bar 19, that is located beneath'said pocket, and movingit downward depress the standards 15 against the tension of the spring23, thereby sagging the walls of the pockets. As soon as the blocks havepassed the bar 19 the spring 23 reacts, drawing up the standards, andthereby suddenly drawing the Walls of the pocket taut. By this means allof the cloth forming the pockets will be shaken, and as the air is nowout off from this pocket the dust Will drop from the inner wall of thepocket onto the top of the carrier. The cloth forming the pockets willby this means be thoroughly and quickly cleaned, and the adhering dustwill be deposited in the pockets of the carrier. As the carrier passesaround the sprocket-wheels at the end of the casing the dust will fallout of the pockets into a suitable trough 41, from which it may beremoved by a suitable conveyer 43. In some instances I prefer to arrangethe bars at the lower ends of the pockets, so that they will move,instead of those at the top of the pocket. I have shown thisconstruction in Figs. 4 and 5. In this instance the bars at the top ofthe pockets are stationary and correspond to the cross-bars 11 in theother construction. The movable bars 13 are arranged at the bottoms ofthe pockets, and are engaged directly by the inclined blocks 39, whichare upon the top of the carrier. The standards 15 are in this instanceconnected to the center of the cross-bar 1S and t0 the center of thespring-bar 23. -This construction will be seen to be, however, simply anequivalent of that already described.

I claim as my invention 1. In combination with a dust-collecting mediumformed into pockets, springs adapted to hold the pockets distended, anendless chain located beneath the mouths of the pockets, a cam-piecesecured to the chain to engage and more the pocket-frames or a barthereon against the force of the springs and thereby collapse thepockets, and a series of flexible connected slats also carried by thechain to receive the dust dislodged.

2. In combination With a dust-collecting medium formed into pockets,springs to hold the pockets distended, an endless chain located beneaththe pockets, a series of slats secured to the chain, flexibleconnecting-pieces between the slats arranged to form gutters, and meansfor collapsing the pockets.

In testimony whereof I have hereunto set 3 my hand this 28th day ofDecember, 1889.

JOHN J. GERARD. In presence of- P. 0. PAUL, BESSIE BooTH.

